News
Heavy rainfall event
Heavy rains crossed the HOAL catchment area last week. In 24 hours, 160 mm of...
Sap flow measurements on trees
For measuring transpiration on trees, so called "Sap Flow sensors" were installed. In sum six...
Modification work at the catchment outlet - MW
As the catchment outlet (MW) is one of our most important measurment points, a new radar sensor is now...
Maintenance works and eddy covariance calibration
In august Borbala Szeles, Patrick Hogan and Lovrenc Pavlin were on site, supported by...
Heavy rainfall event - flooding video
As predicted last weekend heavy rain fall occured in eastern Austria. Also the HOAL was affected by high...
Science Questions – What are the Dynamics and Controls of Subsurface Flow and Transport?
Much of the pollution in the landscape moves in the subsurface. The timing and location of pollution transport is driven by the groundwater dynamics. Groundwater levels and chemical characteristics are monitored at numerous locations within the HOAL.
A number of geophysical surveys are being conducted to improve the delineation of hydrogeological heterogeneities and processes in the subsurface. The techniques include ground penetrating radar, induced polarization and low-induction number electromagnetic induction methods. The information on the subsurface so obtained is combined with numerical flow and transport models.
To understand the stream-aquifer interactions several tracer tests were performed. These tests allowed the estimation of stream bank fluxes. Infrared cameras are used to identify hotspots of groundwater recharge into the stream. Mass balances over sections of the stream are used to determine the role of near-stream riparian trees on the daily fluctuations of the stream flow during low flow conditions.
